Finishing the round, the sack of coin as an improvised weapon is -2 to hit.
Orofer strikes his spider (10 misses) Fitz strikes his spider (16 hit, 1 damage) and nicks it Ruby strikes her spider (18 hit, 1 damage) and nicks it Quasmus strikes Orofer's spider (15-2 hit, 1 damage) and nicks it
Next round the PCs win initiative (5 vs 1)
Orofer strikes his spider (14 hit, 1 damage) and scores another nick Fitz strikes his spider (13 hit, 4 damage) and dispatches it Ruby strikes her spider (6 miss) Quasmus strikes Orofer's spider (12-2 miss)
Cedric pulls Orofer out of the way, shaking the spider loose.
Olaf steps in and skewers the spider (16 + 2 hit, 4 damage).
Quasmus jumps back, and is unable to land a blow on the remaining spider (10 miss).
The next round the remaining spider wins initiative (6 vs 5) and strikes at Ruby and misses (11 miss).
Ruby strikes back and dispatches it (17 hit, 6 damage).
Orofer seems to be turning blue from the poison. You could get back to the surface in two turns if you rushed, though next turn was supposed to be a turn of rest. Missing the turn of rest would have some negative impacts (-2 to hit, -1 to physical tasks such as door opening). If you don't rest after 11 turns of activity, you would become exhausted on turn 18.
There is some delay in trying to re-open the secret door, however, you do make it to the surface and collapse winded from the effort. Zebulon incants a spell and Orofer's color returns and he soon wakes up. Orofer is still somewhat wounded.